The larger internet has the same problem - duplicate content farms, making the "original" of a piece of content hard to discern. It's certainly not a solved pro

The larger internet has the same problem - duplicate content farms, making the "original" of a piece of content hard to discern. It's certainly not a solved problem but by tracking which copy is seen first, using links to imply trust, etc, a reasonable search can still be provided. You'll never have 100% accurate attribution, but that's kinda the point. And when it comes to trusting the search provider, well, how do you choose now beyond seeing consistent result quality? Agreed trust is a problem with hidden services in general, but I think it's one we'll solve by reframing what it means to 'trust' a site in the first place.